概括
这项研究引入了一种新的激光多普勒振动仪引导的数字图像相关性 (DIC) 方法,用于精确的振动测量. 该技术通过过噪声显著提高分辨率,使纳米级全场振动分析成为可能.
科学领域:
- 光学测量 测量 光学测量
- 振动分析 振动分析
- 信号处理 信号处理
背景情况:
- 数字图像相关性 (DIC) 是用于全场测量的关键非接触式光学方法.
- 实际的DIC应用受到噪声的影响,使实验分辨率低于理论极限.
研究的目的:
- 开发一种改进的DIC方法,用于准确的振动测量.
- 为了克服DIC中的噪声限制,以提高分辨率.
主要方法:
- 提出了一种激光多普勒振动计 (LDV) 引导的数字图像相关性 (DIC) 方法.
- 使用LDV单点数据实施了3D频域协作过 (3D-FDCF) 方法.
- 结合空间低通选与时间带通选,以LDV数据为指导.
主要成果:
- 3D-FDCF方法有效地处理了像素智能的DIC位移场.
- 在测量几百纳米振动幅度方面表现出能力.
- 在100毫米×100毫米的样本上实现了干扰度尺度全场振动测量.
结论:
- 以LDV引导的DIC方法显著提高了振动测量准确度.
- 3D-FDCF技术为高分辨率,全场振动分析提供了强大的解决方案.
- 这种方法允许精确的纳米尺度测量,以前无法用标准的DIC.
相关概念视频
01:30Electronic Distance Measuring Instruments
32
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
32
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
998
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
998